FirstPower Battery Adapter for Makita 18V Lithium-ion Power Tools,Convert Milwaukee 18V or Dewalt 20V Lithium-ion Battery to Makita 18V Lithium-ion Battery - - Amazon.com
Makita USA - Product Details -BL1430B
Makita 18V LXT Lithium-Ion High Capacity Battery Pack 4.0Ah and Charger Starter Kit w/bonus 18V LXT 5 in. Random Orbit Sander BL1840BDC1-XOB1 - The Home Depot